Transconductance filter control system
a control system and filter technology, applied in gain control, frequency selective two-port networks, continuous tuning, etc., can solve the problems of large silicon wafer or circuit size, large power consumption, and inability to manually adjus
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Other objects, features and advantages will occur to those skilled in the art from the following description of a preferred embodiment and the accompanying drawings, in which:
FIG. 1 is a schematic view of a prior art transconductance filter circuit;
FIG. 2 is a schematic view of a prior art transconductance filter circuit incorporating a manual transconductance control circuit;
FIG. 3 is a graph showing the frequency response of a prior art transconductance filter;
FIG. 4 is a schematic view of a prior art transconductance filter circuit incorporating a phase look loop based automatic transconductance control circuit;
FIG. 5 is a schematic view of the transconductance filter control system of this invention in which the output of the master transconductance amplifier and the tuning signal are currents;
FIG. 6 is a diagrammatic view of another embodiment of the transconductance filter control system of this invention in which the output of the master transconductance amplifier and the tun...
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Description
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Application Information
- IPC
- H03H11/04; H03J3/00; H03J3/04; H03H11/00; H03H11/54
- CPC
- H03H11/0422; H03J3/04; H03H11/54
- Inventors
- MCCALL, KEVIN J.; SPAULDING, JR., GEORGE R.